Looks like certbot isn’t very efficient handling 50 - 100 domain names. Normally, 100 domain names should need 100 * time of one domain. Or one configuration file is too big and the parsing is not very good.

But this is a question the certbot engineers may have a look - @schoen

I’m not sure this is the right log, since this log covers only about 1 minute in time, doesn’t show any certificate requests happening, and shows an interrupted Certbot run. I was hoping to see the entire log for a time when 100 certificates were successfully obtained.

Thanks, but those log files only contain events from 2018-07-24 07:02:12,261 to 2018-07-24 07:03:59,247, a range of less than two minutes in all. That still doesn’t seem to reflect the huge time lapse that you’re talking about.